Ultrasonic humidifier



FIG. 1 is a top, side and front perspective view of an ultrasonic humidifier showing my new design;

FIG. 2 is an exploded top, side and rear perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a left side elevation view thereof;

FIG. 8 is a rear elevation view thereof.

The oblique-line shading on portions of the article is understood to represent translucent material. 

The ornamental design for an ultrasonic humidifier, as shown and described. 